12x+15+9x+41 ...

I assume the problem is asking you to simplify the equation, so that's what we'll do!

First, let's combine like terms. We'll take the 9x and add it to the 12x, and take the 15 and add it to the 41.

After we do that, we're left with ...

21x+56.

And, that's as far as we can go! Since we don't know what it's supposed to be equal to or what x is equal to, we can't come to a real answer and as far as we can do is what we did here with simplifying it.